One year after California Air Resources Board Chairwoman Mary Nichols decided to sell off some energy stocks that showed a potential conflict of interest with her role as a state regulator, records show her diverse investment portfolio still contains many energy interests. Nichols also sold stock in a company that stands to profit from new diesel regulations that the ARB is set to adopt this fall, and other companies that have business before the board, according to financial disclosure documents filed with the Fair Political Practices Commission. But FPPC records show that she and her husband, attorney John Duam, sold...